IfcEllipseProfileDef

Semantic definitions at the entity

Entity definition

IfcEllipseProfileDef defines an ellipse as the profile definition used by the swept surface geometry or the swept area solid. It is given by its semi axis attributes and placed within the 2D position coordinate system, established by the Position attribute.

HISTORY New entity in IFC2x

Figure 388 illustrates parameters for the ellipse profile definition. The parameterized profile defines its own position coordinate system. The underlying coordinate system is defined by the swept surface or swept area solid that uses the profile definition. It is the xy plane of either:

IfcSweptSurface.Position
IfcSweptAreaSolid.Position

Or in case of sectioned spines it is the xy plane of each list member of IfcSectionedSpine.CrossSectionPositions. By using offsets of the position location, the parameterized profile can be positioned centric (using x,y offsets = 0.), or at any position relative to the profile. Explicit coordinate offsets are used to define cardinal points (for example, upper-left bound). The location of the position coordinate system defines the center of the ellipse. The SemiAxis1 attribute defines the first radius of the ellipse in the direction of the X axis, the SemiAxis2 attribute defines the second radius of the ellipse in the direction of the Y axis.

NOTE The semi axes of the ellipse are rectangular to each other by definition.

Figure 388 — Ellipse profile

Attribute definitions

#	Attribute	Type	Cardinality	Description	C
4	SemiAxis1	IfcPositiveLengthMeasure	[1:1]	The first radius of the ellipse. It is measured along the direction of Position.P[1].	X
5	SemiAxis2	IfcPositiveLengthMeasure	[1:1]	The second radius of the ellipse. It is measured along the direction of Position.P[2].	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
IfcProfileDef
1	ProfileType	IfcProfileTypeEnum	[1:1]	Defines the type of geometry into which this profile definition shall be resolved, either a curve or a surface area. In case of curve the profile should be referenced by a swept surface, in case of area the profile should be referenced by a swept area solid.	X
2	ProfileName	IfcLabel	[0:1]	Human-readable name of the profile, for example according to a standard profile table. As noted above, machine-readable standardized profile designations should be provided in IfcExternalReference.ItemReference.	X
	HasExternalReference	IfcExternalReferenceRelationship @RelatedResourceObjects	S[0:?]	Reference to external information, e.g. library, classification, or document information, which is associated with the profile.	X
	HasProperties	IfcProfileProperties @ProfileDefinition	S[0:?]	Additional properties of the profile, for example mechanical properties.	X
IfcParameterizedProfileDef
3	Position	IfcAxis2Placement2D	[0:1]	Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied.	X
IfcEllipseProfileDef
4	SemiAxis1	IfcPositiveLengthMeasure	[1:1]	The first radius of the ellipse. It is measured along the direction of Position.P[1].	X
5	SemiAxis2	IfcPositiveLengthMeasure	[1:1]	The second radius of the ellipse. It is measured along the direction of Position.P[2].	X

Definitions applying to Common Use Definitions

Concept inheritance

#	Concept	Model View
IfcProfileDef
	Property Sets for Objects	Common Use Definitions

Formal representations

XSD Specification

 <xs:element name="IfcEllipseProfileDef" type="ifc:IfcEllipseProfileDef" substitutionGroup="ifc:IfcParameterizedProfileDef" nillable="true"/>

 <xs:complexType name="IfcEllipseProfileDef">

  <xs:complexContent>

   <xs:extension base="ifc:IfcParameterizedProfileDef">

    <xs:attribute name="SemiAxis1" type="ifc:IfcPositiveLengthMeasure" use="optional"/>

    <xs:attribute name="SemiAxis2" type="ifc:IfcPositiveLengthMeasure" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcEllipseProfileDef

 SUBTYPE OF (IfcParameterizedProfileDef);

  SemiAxis1 : IfcPositiveLengthMeasure;

  SemiAxis2 : IfcPositiveLengthMeasure;

END_ENTITY;

 EXPRESS-G diagram

Link to this page

Item	Change	Description
IFC2x3 to IFC4
IfcEllipseProfileDef
Position	MODIFIED	Instantiation changed to OPTIONAL.

	ellipsoides Profil - parametrische Definition
	Ellipse Profile Def
	Définition de profil ellipsoïdal